Wii having trouble reading Disks

I have 3 games for my wii atm (RE4, Zelda,sports) and soon to have mario galaxy tomorrow.) my wii has some trouble reading wii sports after the screen that says stuff about the wiimote but that might just be because I have a lot of scratches on it. my wii can't read zelda at certain points ingame and it only has a couple of scratches. I haven't played RE4 enough to tell if it can't read some parts of it. My question is, could there be dust or something in my wii? Maybe I should get it cleaned. Allright thanks for the help